What this header is
The Amphenol FCI 87052-142HLF is the 42-position member of the BERGSTIK II dual-row header series — an unshrouded, 0.100-inch (2.54 mm) pitch board-to-board interconnect with through-hole solder tails and square male pins. Each circuit is rated 5 A at 110 V, and all 42 positions are loaded. The push-pull fastening type means the header seats into the matching receptacle under insertion force alone — no screw, latch, or TPA retainer on the header itself. Contact plating on the mating face is gold or Gold GXT at 30.0 µin (0.76 µm) — the GXT variant adds a hardened outer layer that resists fretting wear better than plain gold in field-service environments where the header may be mated and unmated repeatedly. The base material is phosphor bronze, which holds spring tension across the lifecycle without the brittleness of beryllium copper alternatives.
Board layout fit
The 0.100-inch row spacing matches standard 0.100-inch pitch receptacle footprints — the board layout follows the same grid as the original BERGSTIK II footprint. The insulation height is 0.100 inch (2.54 mm), which sets the post stand-off above the board surface and must be accounted for in the mated stack height when this header pairs with a vertical or right-angle receptacle. Contact post length is 0.120 inch (3.05 mm), so the board hole diameter and plating must accommodate that stand-off in the Z axis. At 42 positions across two rows, this is an unshrouded board-to-board header — the square-pin geometry provides mechanical retention in the receptacle, but the unshrouded design means the header relies entirely on the receptacle housing for keying and polarisation. Check that the mating receptacle has the correct polarisation slot or chamfer to prevent mis-mate in the application.
Mating and application context
This is a board-to-board header — it mates with a matching BERGSTIK II dual-row receptacle with 0.100-inch pitch and the same position count. The header carries no integral locking feature; the retention comes from the receptacle's housing latch or friction fit. The UL94 V-0 housing rating means the connector meets the flammability floor for industrial equipment enclosures — relevant when the board assembly sits inside a closed chassis with limited airflow. At 5 A per circuit and 110 V, the rating covers signal and low-power bus duties within industrial control boards and instrumentation. Do not use this as a power bus bar — the 5 A is a per-contact rating, and running multiple circuits near their limit in a warm enclosure requires the standard derating curve for the housing material. At 42 circuits in a dual-row layout, the thermal path through the board is a layout consideration if the application runs continuous current across many positions simultaneously.